216864688 has 20 divisors (see below), whose sum is σ = 420879808. Its totient is φ = 108250560.

The previous prime is 216864679. The next prime is 216864691. The reversal of 216864688 is 886468612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1248 + ... + 20863.

Almost surely, 2^216864688 is an apocalyptic number.

It is an amenable number.

216864688 is a deficient number, since it is larger than the sum of its proper divisors (204015120).

216864688 is a wasteful number, since it uses less digits than its factorization.

216864688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22732 (or 22726 counting only the distinct ones).

The product of its digits is 884736, while the sum is 49.

The square root of 216864688 is about 14726.3263579210. The cubic root of 216864688 is about 600.7995710406.

The spelling of 216864688 in words is "two hundred sixteen million, eight hundred sixty-four thousand, six hundred eighty-eight".